Research on deep peak shaving transformation of denitration system of supercritical CFB boiler
LI Peng
Abstract：In this paper,the causes of NOxexceeding the standard at low load of supercritical fluidized bed boiler were analyzed.It was found that the temperature drop in the reaction zone was the main reason for the reduction of efficiency.Using liquid ammonia or ammo-nia water as denitration reducing agent can only increase denitration efficiency by 5%,and the effect is not ideal.At low load,the tem-perature in the furnace decreases and is only about 10℃higher than the inlet of the separator.Adding a urea spray gun at the seconda-ry air outlet or the ignition oil gun outlet can not obtain a high denitration efficiency.After analysis and comparison,the feasible transfor-mation scheme is to install SCR system in the two-stage economizers,or use flue gas recirculation to introduce the low-temperature flue gas into the primary air system.The installation of SCR system needs to take anti blocking and anti-wear measures for catalyst,and the operation of flue gas recirculation should try to avoid too much reduction of boiler efficiency.
Keywords：circulating fluidized beddeep peak shavingSCRflue gas recirculation
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 35-39,44 )